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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Med Sci Sports Exerc. 2012 Oct;44(10):2009–2016. doi: 10.1249/MSS.0b013e318258cb36

Table 2.

Bias (Identified – Classified), Probability of Correct Classification by Algorithms (Alg[Troiano] and Alg[Choi]) with Window 60-min and 90-min during ~24-h and during Both Monitors-Worn Waking Periods (Waist Monitor).

Bias (min) Probability of correct classification
60-min 90-min 60-min 90-min
Wrist VM 24-h Alg[Troiano] 77 (84)
19 50 106 a, b, c [−8 to 313]
17 (45)
−4 025 [−34 to 165]
0.93 (0.07)
0.92 0.96 0.99 [0.71 to 1.00]
0.98 (0.03)
0.97 0.99 1.00 [0.85 to 1.00]
Alg[Choi] 61 (73)
2 43 73 [−8 to 267]
10 (32)
−4 0 15 [−34 to 120]
0.95 (0.07)
0.95 0.97 0.99 [0.76 to 1.00]
0.98 (0.03)
0.980.99 1.00 [0.90 to 1.00]
V 24-h Alg[Troiano] 138 (110)
63 102 183 [0 to 400]
67 (88)
0 28 99 [−24 to 341]
0.89 (0.09)
0.87 0.92 0.94 [0.65 to 1.00]
0.94 (0.07)
0.92 0.95 0.99 [0.71 to 1.00]
Alg[Choi] 87 (94)
18 49 97 [−8 to 340]
27 (49)
0 15 28 [−34 to 170]
0.93 (0.08)
0.93 0.96 0.99 [0.69 to 1.00]
0.97 (0.04)
0.96 0.98 0.99 [0.86 to 1.00]
Waist V 24-h Alg[Troiano] 116 (88)
48 112 160 [0 to 349]
48 (70)
1 31 61 [−25 to 304]
0.90 (0.07)
0.87 0.90 0.95 [0.70 to 1.00]
0.95 (0.05)
0.94 0.97 0.98 [0.74 to 1.00]
Alg[Choi] 40 (47)
14 28 49 [−8 to 230]
16 (42)
0 2 20 [−29 to 215]
0.96 (0.04)
0.95 0.97 0.99 [0.80 to 1.00]
0.98 (0.04)
0.98 0.99 1.00 [0.81 to 1.00]
awake Alg[Troiano] 97 (73)
53 83 131 [0 to 349]
36 (62)
0 20 46 [−25 to 305]
0.86 (0.11)
0.82 0.870.92 [0.43 to 1.00]
0.94 (0.09)
0.92 0.95 1.00 [0.5 to 1.00]
Alg[Choi] 32 (47)
2 18 40 [−12 to 230]
12 (43)
0 1 18 [−29 to 215]
0.95 (0.07)
0.93 0.96 0.99 [0.62 to 1.00]
0.97 (0.06)
0.96 0.98 1.00 [0.65 to 1.00]
a b c

a – 25th percentile; b – 50th percentile (median); c – 75th percentile.

Values are means (SD), medians, 25th and 75th percentiles; ranges are in square brackets.

V- vertical axis (single); VM - vector magnitude of 3 axes (vertical, horizontal, 3rd) calculated as VM = √x2 + y2 + z2, where x, y and z are the measurements from the 3 axes.